Intel SC5299WS User Manual

2.4.2.13 

DC/DC Converters Loading 

The following table defines the power and current ratings for the three DC/DC converters 
located on the cage; each is powered from a +12V5 rail. The three converters meet both static 
and dynamic voltage regulation requirements for the minimum and maximum loading conditions. 

Note: 3.3V/5V combined power limit: 170 W max. 

+12VDC Input DC/DC Converters 

 

+3.3V Converter 

+5V Converter 

-12V Converter 

MAX Load 

24.0A 

30.0A 

0.3A 

MIN Static/Dynamic Load 

0A 

0A 

0A 

Max Output Power, see note 1 

3.3x24=79.2W 5x30=150W  0.3x12=4.8W 

Notes: 

1. 

Maximum continuous total DC output power should not exceed 610 W..  

2. 

Peak power and current loading shall be supported for a minimum of 12 seconds. 

3. 

Combined 3.3V and 5V power shall not exceed 170 W. 

 

2.4.2.14 

DC/DC Converters Voltage Regulation 

The DC/DC converters’ output voltages stay within the following voltage limits when operating at 
steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise. 
All outputs are measured with reference to the return remote sense signal (ReturnS). The 3.3V 
and 5V outputs are measured at the remote sense point; all other voltages are measured at the 
output harness connectors.  

Converter Output 

Tolerance 

MIN 

NOM 

MAX 

UNITS 

+ 3.3VDC 

- 5%/+5% 

+3.14 

+3.30 

+3.46 

V

rms

 

+ 5VDC 

- 5%/+5% 

+4.75 

+5.00 

+5.25 

V

rms

 

+ 12VDC 
(12V1/2/3/4) 

- 5%/+5% 

+11.40 

+12.00 

+12.60 

V

rms

 

- 12VDC 

- 10%/+10% 

-10.80 

-12.00 

-13.20 

V

rms

 

+ 5VSB 

See Power Supply Specification; measured at the power distribution board 
harness connectors. 

2.4.3 

DC/DC Converters Dynamic Loading 

The output voltages remain within limits specified for step loading and capacitive loading, as 
specified in the following table. The load transient repetition rate is tested between 50 Hz and 5